Retournement horizontal

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <iostream>
using namespace cv;
using namespace std;



int main( int argc, char** argv )


{
MatIterator_<Vec3b> it,end ;
    int R;
int V;
int B;


Mat image; 
image = imread("une_image.jpg", CV_LOAD_IMAGE_COLOR); 
if(! image.data ) 
{
cout << "Impossible de charger l'image" << endl ; 
return -1;
}


Mat imagenb = image.clone();

for( it = imagenb.begin<Vec3b>(), end = imagenb.end<Vec3b>(); it != end; ++it) 
	{
                {


**********

                }

	}


imwrite("nb.jpg",imagenb);

namedWindow( "Display window", CV_WINDOW_AUTOSIZE ); 
imshow( "Display window", imagenb ); 
waitKey(0); 
return 0;
}